This demonstrates a multiple random transitions.
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script src="jquery.backstretch.min.js"></script>
<script>
$.backstretch([
"pot-holder.jpg",
"coffee.jpg",
"dome.jpg"
], {
duration: 4000,
transition: 'push_left|push_right|cover_up|cover_down|fade',
transitionDuration: 250
});
</script>